ACU digital rank insignia represents the rank of each personnel in the US military. The higher rank the officer is the more authority and responsibility the officer has. There are 3 categories in the rank system, enlisted members being the lowest, warrant officers being higher than enlisted members and commissioned officers being above all. Within each category there are ranks, for enlisted members the lowest rank is Private and the highest rank is Sergeant Major of the Army. Each rank is denoted with a different acu digital insignia identifying ones rank and if they are superior or inferior to other military personnel. Our special rank insignias are pin on insignias that are usually worn on hats, on the shoulder of uniforms or around the waist and chest. Rank insignia aren't only worn by military personnel, they can be worn for style and clothing accessory purposes.